G'day Bob - we're slightly off thread here, but my Crane actually is a Crane. It's obviously made by Lachenal, but on the end is a little metal badge, which looks like it was an original fitting, saying

CRANE & SONS Ltd.,
Patent Concertinas
No 21730
LONDON & LIVERPOOL
Crane & Sons still exist, but they make pianos these days. Still, Mr Crane obviously did a bit more than just introduce the system to the Sally Ann, and if they were sold as Cranes, its hardly surprising that people call them that.

I could never think of myself as Butterworth Driver ...